No thoughts on the glass BBT thermometer, have you tried googling for one?
But, I just wanted to say that I think temping within an hour would still be pretty reliable. You may see a slightly higher temp on the later days, like 0.1 or 0.2, but for most people that would be easy to separate from the big jump of 1.0 degrees or so when you O. The only time it might be a problem is if you have a slow-rise temp... you'd have to read more in TCOYF about that though, I don't know much about it personally.
Good luck!
But, I just wanted to say that I think temping within an hour would still be pretty reliable. You may see a slightly higher temp on the later days, like 0.1 or 0.2, but for most people that would be easy to separate from the big jump of 1.0 degrees or so when you O. The only time it might be a problem is if you have a slow-rise temp... you'd have to read more in TCOYF about that though, I don't know much about it personally.
Good luck!